Intro. ADA Operations Contact Info

Transcription

1 Intro ADA Operations Contact Info Todd Grugel ph: Joe Zilka ph: Harvey Unruh ph:

2 MnDOT ADA Training STANDARD PLANS & PAY ITEMS 2

3 Module Overview PROWAG and Curb Ramp Basics Standard Plan Sheets Curb Ramp Types ADA Pay Items 3

4 Curb Ramp/PROWAG Basics PROWAG requirements are based on slopes, so curb ramps cannot simply meet a certain length to be compliant. A 6 inch high curb does not necessarily mean that a ramp should be 6 foot long; it depends on whether the area behind the ramp slopes up, down or is flat from the top of curb. 4

5 Curb Ramp/PROWAG Basics Minimum 4 foot wide Pedestrian Access Route (PAR) with a maximum cross slope of 2% is required. The PAR must be continuous and unobstructed. The PAR shall connect accessible elements, spaces and facilities. 5

6 Curb Ramp/PROWAG Basics If longitudinal slope exceeds 5 percent, or there is a change in direction, landings must be provided on any pedestrian facility. Maximum ramp slope is 8.3 percent. Maximum length of initial ramp is 15 feet. Slopes and dimensions are absolute. PROWAG allows no tolerances for exceeding these maximums. 6

7 Standard Plate 7036G Pedestrian Curb Ramp - Discontinued 4 ft. by 4 ft. minimum landing with maximum 2% cross slope in all directions REQUIRED Ramp lengths depend on grades, not dimensions Served as the foundation for the Curb Ramp Standard Plans 7

8 Standard Plans 8

9 Standard Plans New in 2013: Ramp slope ranges 9

10 Standard Plans 10

11 Standard Plans When constructing directional ramps, the triangular concrete piece shall be poured integral with the curb and gutter (Directional Curb). 11

12 Standard Plans 12

13 Curb and Gutter Details Always maintain flow line and use modified Pedestrian Access Route curb and gutter sections. Perpendicular and parallel ramps can have a maximum 5% gutter slope because the pedestrian s path of travel is perpendicular to the gutter flow line. 13

14 Curb and Gutter Details Curb ramp types where the pedestrian s travel is not perpendicular to the gutter flow line (i.e. directional, depressed corners and fan ramps) shall have a flattened gutter slope of 2% to 3%. 14

15 Standard Plans 15

16 Side Treatments When adjacent to pavement, flares shall be constructed at 8-10% max slope. When adjacent to turf, 1:6 graded flare is generally preferred. 16

17 Side Treatments When adjacent to turf, a 2-3 concrete flare may be used. 17

18 Side Treatments Approach nose detail for downstream side of traffic. 18

19 Detectable Edge at quadrant All constructed curbs must have continuous detectable edge for the visually impaired. 19

20 Detectable edge at quadrant Curb transitions are considered a detectable edge when the taper starts within 3 of the edge of truncated domes. 0 0 CURB TAPER MINIMUM CURB HEIGHT / 4 PREFERRED 20

21 Standard Plan Sheets 21

22 Vertical Face Curb V-curb adjacent to building 22

23 V-Curb V-curb adjacent to landscape and outside sidewalk limits (preferred) 23

24 V-Curb V-curb adjacent to landscape and inside sidewalk limits 24

25 Curb Ramp Types Perpendicular ramp Parallel ramp One-way directional ramp Combined directional ramp Depressed corner Tiered perpendicular ramp Fan ramp Diagonal ramp (not recommended) 25

26 Perpendicular Ramp is perpendicular to the curb line. Grade break occurs at the top of the ramp and the flow line. 26

27 Parallel Ramp is parallel to the curb line. Landing occurs at the bottom of the ramp. Landing 27

28 One Way Directional LESS THAN 5% RAMP SLOPE, LANDING NOT REQUIRED 28

29 Combined Directional 29

30 Depressed Corner Landing 30

31 Tiered Perpendicular Used where the initial curb ramp cannot make up the elevation difference, so a secondary ramp is needed 31

32 Fan Landing 32

33 Standard Plan Sheets New in 2013: Reinforcement Details 33

34 Diagonal Ramp Should only be used after all other curb ramp types have been evaluated and deemed impractical 34

35 Diagonal Ramp Least Preferred 35

36 Traditional Vs. ADA Pay Items TRADITIONAL PAY ITEMS REMOVE CURB AND GUTTER REMOVE BITUMINOUS PAVEMENT REMOVE CONCRETE WALK SAWING BITUMINOUS PAVEMENT SAWING CONCRETE WALK BITUMINOUS PATCHING MIXTURE CONCRETE CURB & GUTTER B624 CONCRETE CURB & GUTTER B424 AGGREGATE SURFACING CLASS 5 CONCRETE CURB DESIGN V4 CONCRETE CURB DESIGN V6 4" CONCRETE WALK 6" CONCRETE WALK COMMON EXCAVATION COMMON BORROW SUBGRADE PREPARATION SELECT TOPSOIL BORROW SODDING TYPE LAWN ADA PAY ITEMS REMOVE AND REPLACE BITUMINOUS PAVEMENT MILL AND PATCH BITUMINOUS PAVEMENT REMOVE CONCRETE WALK CONCRETE CURB AND GUTTER CONCRETE WALK CONCRETE CURB DESIGN V SITE RESTORATION - ADA pay items allow less time tracking quantities in the field and more time ensuring a quality product 36

37 Mill and Patch Bit. Pavement S-1 (2232) MILL Construction AND Requirements PATCH BITUMINOUS PAVEMENT (ADA) S-1.1 The This bituminous work shall consist surface of shall milling be milled and patching to a depth the of existing 2 inches bituminous for a width surface of 2 feet adjacent in front to the of the The curb newly compacted and constructed gutter surface as shown curb shall and in be gutter the at Plans a in level accordance and resulting conformance with in the the edges/joints provisions with requirements of between MnDOT of the MnDOT 2232, surface 2360, 2232, and other the Mill gutter Contract Pavement face/existing Surface. provisions, The and bituminous Contractor the following: roadway shall place are bituminous less than ¼ material inch vertically. over the milled surface. 37

38 Mill and Patch (2232) Mill and patch bit. pavement Lin Ft 38

39 Remove and Replace Bit. Pavement S-1 (2104) REMOVE AND REPLACE BITUMINOUS PAVEMENT (ADA) S-1.1 Construction Requirements This work shall consist The Contractor of full depth shall sawing, provide removing, a full depth and bituminous replacing the sawcut bituminous at a line surface that is adjacent offset 2 feet to the from newly the constructed proposed gutter curb face and as gutter shown in accordance in the Plans. with MnDOT 2104, 2360, other Contract provisions, and the following: 39

40 Remove and Replace Bit. Pavement (2104) Remove & Replace Bit. Pavement Lin Ft Compacted bit surface to be finished flush with gutter face (¼ tolerance) 40

41 Concrete Curb & Gutter S-1 S-1.1 (2531) CONCRETE Construction Requirements CURB & GUTTER (ADA) The Contractor must form, at a minimum, the top 1½ inches of the gutter face. The Contractor shall not Concrete This Curb work and shall Gutter consist The of constructing curb and gutter Concrete shall Curb be constructed and Gutter to and meet the the necessary details in Aggregate the Plan. The use the existing roadway edge as a form for the top 1½ inches of the gutter face unless approved by the Engineer. Base transition in accordance from the with existing the provisions curb and gutter of MnDOT section 2531, to the other new Contract curb and provisions, gutter section and shall the following: occur within 5 feet of the point where the curb and gutter construction begins. 41

42 Concrete Curb & Gutter Provision Construction requirements cont. If the gutter flow line in front of the proposed curb ramps exceeds 2.0 percent slope, the flow line should be adjusted to allow a flatter slope in front of the curb ramps, but still provide positive drainage. The Contractor must consult with the Engineer before modifying any flow line that will result in the slope of the adjacent bituminous patching exceeding 5 percent 9.0%

43 Concrete Curb & Gutter (2531) Concrete Curb and Gutter Lin Ft This work shall consist of constructing concrete curb and gutter and the necessary aggregate base. No specific curb height pay items are specified in the plan. Simply match existing curb height at removal limit and transition into PAR curb and gutter at the pedestrian ramps. 43

44 Concrete Walk S-1 (2521) Construction CONCRETE Requirements WALK (ADA) S-1.1 Grading If not otherwise detailed in the Plan, all fill sections shall be graded flush with the top of walk for a minimum (A) 18 from Concrete This the work edge Walk shall of walk consist The and walk of then constructing shall down be at constructed a maximum Concrete as Walk, 1:3 detailed slope including to the existing necessary Plan terrain. and conform Subgrade The Contractor to Preparation, the shall requirements Aggregate blend in the Base, toe of MnDOT of and fill Grading slope 2521, and as Walks. adjacent indicated areas in the so Plan, as not in to accordance adversely with affect the drainage. provisions of MnDOT 2112, 2211, 2521, other To avoid Contract corner provisions, breaks, all and walk the following: edges shall be formed and constructed perpendicular to the back of curb and gutter sections and concrete structures for a one foot minimum distance. 44

45 2521 Concrete Walk ADA Landings The Contractor shall select a truncated dome product from the approved products list. 45

46 Concrete Walk (2521) Concrete Walk Sq Ft If common borrow requirements exceed 8 CY (CV) at any individual site/quadrant, than the common borrow required at that location specifically required for in the Plan shall be paid for at $20/CY (CV). 46

47 Concrete Curb Design V S-1 (2531) Construction CONCRETE Requirements CURB DESIGN V (ADA) S-1.1 This work shall consist The Concrete of constructing Curb Design Concrete V shall Curb be Design constructed V of as varying detailed heights in the up Plan. to 8 Concrete inches as Curb detailed Design in the V may Plan be and constructed in accordance independent with the of provisions or integral of to MnDOT the adjacent 2531, sidewalk. other Contract The bottom provisions, elevation and the of the following: V Curb shall match the bottom elevation of the adjacent sidewalk slab. When the Concrete Curb Design V is constructed independent of the sidewalk, the portion of the Concrete Curb Design V that will have new concrete walk placed against it shall be clean so as to maximize bonding between the walk and V curb.

48 Concrete Curb Design V (2531) Concrete Curb Design V Lin Ft The locations requiring the use of Concrete Curb Design V, and the height of the Concrete Curb Design V to be constructed shall be determined by the Engineer. 48

49 Site Restoration (2575) Site Restoration - Each This work consists of site grading and the turf establishment adjacent to pedestrian facilities as detailed in the Plans. Intended for areas where pedestrian ramps are being built, typically in a quadrant of two intersecting roadways 49

50 Site Restoration (2575) Site Restoration - Each If not otherwise detailed in the Plan, all cut section side slopes shall be finished graded flush from the top of concrete surface at a maximum 1:6 slope up to 5 feet from the edge of walk, or straight graded to the existing ground elevation 5 feet from the edge of the walk. 50

51 Site Restoration (2575) Site Restoration - Each Site Grading All areas adjacent to newly constructed walk and top of curb shall be graded flush with the top of walk and top of curb. All stockpiled topsoil must be replaced within the same quadrant from which it was stripped. The minimum depth of topsoil shall be 4 which shall be achieved using select topsoil borrow if necessary. 51

52 Site Restoration (2575) Site Restoration - Each Any topsoil borrow that is required and not accounted for in the Plan shall be Select Topsoil Borrow paid at $45/CY (LV). 52

53 Site Restoration (2575) Site Restoration - Each Turf Establishment All areas that are disturbed as a result of concrete walk and curb and gutter construction including but not limited to curb ramp, curb and gutter, and sidewalk/trail construction shall be seeded and stabilized in accordance with the Plans, Specifications, and Special Provisions. 53

54 Questions? ADA Training Module: Standard Plans & Pay Items 54